Hey there!
Prime numbers are basically only approximately 2 FACTORS... 1 & that particular number
3 is PRIME because the only factors it has is 1 & 3 (so we can eliminate this as your possible answer)
29 is PRIME because it has 1 & 29 as its factors (we can eliminate this as your possible answer)
71 is PRIME because it has 1 & 71 as its factors as well! (So we can eliminate as your possible answer)
This leads Option B as your answer
Good luck on your assignment and enjoy your day!
~LoveYourselfFirst:)